CN202709076U - Quick start system of combined cycle unit - Google Patents
Quick start system of combined cycle unit Download PDFInfo
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- CN202709076U CN202709076U CN 201220280985 CN201220280985U CN202709076U CN 202709076 U CN202709076 U CN 202709076U CN 201220280985 CN201220280985 CN 201220280985 CN 201220280985 U CN201220280985 U CN 201220280985U CN 202709076 U CN202709076 U CN 202709076U
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- condenser
- water
- combined cycle
- valve
- cycle unit
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Abstract
The utility model relates to a quick start system of a combined cycle unit. The quick start system of the combined cycle unit comprises a condenser (20), and is characterized in that a water outlet of the condenser (20) is connected with the input end of a condensation water flow meter (1) through a condensation water pump (5) and a shaft seal cooler (6). The output end of the condensation water flow meter (1) is divided into two ways, one way is communicated with a boiler of the combined cycle unit through a condensation water shut-off valve (2), and the other way is connected with a backwater port of the condenser (20) through a recycling shut-off valve (3) and a recycling adjusting valve (4). A steam outlet of the condenser (20) is connected with a vacuum pump (9) through an air valve. A hydrazine adding point and a dissolved oxygen detection point are arranged between a water outlet of the condensation water pump (5) and a recycling water inlet of the condenser (20). A hydrazine adding point and a dissolved oxygen detection point are arranged on a low-pressure water inlet of the boiler. The quick start system of the combined cycle unit is in an integrated structure of a thermodynamic system, and improves reliability and economy of the system.
Description
Technical field
The utility model relates to a kind of quick start system of Combined Cycle Unit, is used for improving response characteristic and the unit economy of unit.Belong to the Design ﹠ reform technical field that is mainly used in 9F level and above Gas-steam Combined Cycle generating set therrmodynamic system engineering.
Background technology
At present, in the Combined Cycle Unit of utility model factory, because the existence of dissolved oxygen in condensate water and the feedwater is the major reason that causes power plant's heat power equipment corrosion, the corrosion of heat power equipment can affect the performance of material, and the oxide of its generation and dirty sample can affect the safe operation of unit.The content of condensate water and feedwater dissolved oxygen need to be controlled at a comparatively suitable level, and national standard (GB/T 12145-2008) requires the condensate water dissolved oxygen content less than or equal to 50 μ g/L.
The reason that condensate water in the Combined Cycle Unit exceeds standard when starting has following several: 1) demineralized water replenishes.Because demineralized water do not carry out deoxygenation, so rate of water make-up is larger, bring condenser oxygen amount into more.Demineralized water in the sweet-water tank is directly got to the deoxygenation head on condensate tank or condensate tank top by the desalination water pump.Because it is outdoor that sweet-water tank is placed on, the demineralized water temperature is essentially environment temperature, is lower than the condensing water temperature in the condensate tank, and a large amount of low temperature demineralized waters is not in the situation that directly fill into condensate tank through any heating.Thereby cause Excessive Dissolved Oxygen in Condensate.2) condensate undercooling is too high.Condensate undercooling is the supercooling degree of condensate water in the Condenser's Hot Well, and condensate water hot well outlet condensing water temperature is called degree of supercooling with the difference of condenser corresponding saturation temperature under exhaust steam pressure.Condensate undercooling is higher, and namely the saturation temperature under the relative condenser vacuum of condensing water temperature is lower, and then vapor partial pressure power reduces, and the partial pressure of oxygen then increases, thereby the dense oxygen of condensate water is increased.3) valve and condensate pump packing are not tight, and this often causes the content of oxygen dissolved in water that condenses too high.4) Condenser's Hot Well SEA LEVEL VARIATION is the major reason that affects the condensate water dissolved oxygen, and the heat water well level is too high or excessively low, all will bring impact to the content of oxygen dissolved in water that condenses.During depth of immersion deaerating plant certain distance, will make it lose the effect of deep deoxygenization but the heat water well level is too high.
The condensate water dissolved oxygen exceeds standard, the dissolved oxygen that also can cause feeding water exceeds standard, affect the water quality of boiler, accelerate corrosion and the fouling of boiler and other heat power equipment, have a strong impact on the heat transfer efficiency of boiler heating surface, threaten safety, the economical operation of unit, so one of steam index that the supervision of dissolved oxygen content is power plant must be supervised.
But in the prior art, generally be to adopt special-purpose deaerating plant that condensate water is carried out deoxygenation.Not without the Combined Cycle Unit service data of oxygen-eliminating device operation, do not form effective operational mode both at home and abroad yet.
Applicant of the present utility model has adopted 9F Gas-steam Combined Cycle unit when designing, it is advantageous that quick startup, effect in electrical network mainly is to drive peakload and as emergency use, alleviates poor large, the load in electrical network peak, the paddy need for electricity of peak period.Therefore, the combustion gas unit needs frequent start-stop, and shortens as far as possible and open the machine time.
The utility model applicant finds in described unit operation, uses in the former design to start oxygen-eliminating device, has following defective, the one, exist complicated integral structure, accident rate high, the 2nd, when dropping into the oxygen-eliminating device operation, have a strong impact on to start and be incorporated into the power networks the time, can not satisfy the requirement of peak regulation unit.
The utility model content
The purpose of this utility model is for there is complicated integral structure in the special-purpose oxygen-eliminating device that overcomes prior art, accident rate is high and have a strong impact on the defective that starts the time of being incorporated into the power networks, and a kind of quick start system of Combined Cycle Unit is provided.
The purpose of this utility model can adopt following technical scheme to reach:
A kind of quick start system of Combined Cycle Unit comprises condenser, and its design feature is: the delivery port of condenser connects the input of condensing water flow meter by condensate pump, shaft sealing cooler; The output of described condensing water flow meter is divided into two the tunnel, and the condensate water shut-off valve of leading up to is communicated with the boiler of Combined Cycle Unit, and another road connects the water return outlet of condenser by recirculation shut-off valve, recirculation control valve; The venthole of condenser connects vavuum pump by air valve; Setting adds hydrazine point and dissolved oxygen content test point between the recirculation water water inlet of condensate pump delivery port and condenser, arranges at the low pressure water inlet place of boiler to add hydrazine point and dissolved oxygen content test point.
The purpose of this utility model can also adopt following technical scheme to reach:
The Technological improvement plan of realizing the utility model purpose is: the venthole of described condenser is connected with air valve by one of air valve and two is connected with one of air intake of vavuum pump, the gas outlet of vavuum pump is divided into two the tunnel after by gas ejector, one the tunnel connects two junction of one of air valve and air valve, and another road connects the air intake of steam-water separators by three of air valve.
The beneficial effects of the utility model are:
1, the utility model on hardware configuration mainly by the main condensate flowmeter, the condensate pipe shut-off valve, recirculation shut-off valve and recirculation control valve consist of, cancelled the special deaeration plant that prior art must configure, therefore, simplified the overall structure of therrmodynamic system, reliability and the economy of system have been improved, reduced the steam discharge heat loss, the restriction loss of drawing gas of medium-loss and oxygen-eliminating device heating steam, improve the unit operation economy, can save capital expenditure and operation and maintenance cost, through adjusting, every few used device of unit initial stage takes annual 358.53 ten thousand yuan of the operation and maintenance costs of saving of 660,000 yuan of every units.
2, the utility model is owing to having consisted of without the oxygen-eliminating device therrmodynamic system, have the advantages that overall structure is simple, accident rate is low, avoided low feed pump, the oxygen-eliminating device non-return flap that draws gas of jumping of oxygen-eliminating device full water and supercharging in the prior art, deaerator level sternly not make steam turbine or the water inlet of its shaft seal, feed-tank housing leak the serious accidents such as vapour leaks, reduced because of the unit auxiliaries fault and cause the unit load down even make the accident of unit tripping; Improve unit safety.
3, the utility model adopts without the oxygen-eliminating device method of operation, has simplified operation, has saved the power consumption of oxygen-eliminating device, has improved the quick startup ability of unit.
Description of drawings
Below in conjunction with accompanying drawing the utility model is further specified.
Fig. 1 is the structural representation of the fast isolated plant that is used for Combined Cycle Unit that relates to of the utility model.
The specific embodiment
With reference to Fig. 1, the quick start system that is used for Combined Cycle Unit that the utility model relates to comprises condenser 20, and the delivery port of its condenser 20 connects the input of condensing water flow meter 1 by condensate pump 5, shaft sealing cooler 6; The output of described condensing water flow meter 1 is divided into two the tunnel, and the condensate water shut-off valve 2 of leading up to is communicated with the boiler of Combined Cycle Unit, and another road connects the water return outlet of condenser by recirculation shut-off valve 3, recirculation control valve 4; The venthole of condenser connects vavuum pump 9 by air valve; Between the recirculation water water inlet of the delivery port of condensate pump 5 and condenser 20, arrange and add hydrazine point and dissolved oxygen content test point, add hydrazine point and dissolved oxygen content test point in the setting of the low pressure water inlet place of boiler.The venthole of described condenser 20 is connected with air valve by one of air valve 6 and 27 is connected with one of air intake of vavuum pump 9, the gas outlet of vavuum pump 9 is divided into two the tunnel after by gas ejector 10, one the tunnel connects 27 junction of one of air valve 6 and air valve, and another road connects the air intake of steam-water separators 30 by 3 11 of air valve.
With reference to Fig. 1, before giving boiler water filling, the condensate water shut-off valve 2 that is arranged in the condensate pipe keeps cutting out, and the condensate water in the condenser 20 is extracted out by condensate pump 5, behind shaft seal cooler 6, gets back to condenser 20 through condensate water recirculation control valve 4 again.When unit when prepare starting, during to boiler water filling, open again condensate pipe shut-off valve 2, the condensate water condensate pipe shut-off valve 2 that condensing is cried in 20 is sent into boiler 13.
The utility model cancellation heating power starts oxygen-eliminating device, and therrmodynamic system is simplified, and has reduced system's restriction loss, has reduced the medium-loss that draws gas, and security of system is improved in trouble point that simultaneously can the operation of minimizing system.
The utility model has been used for domestic first batch of without oxygen-eliminating device operation Combined Cycle Unit, nearly 200 times of annual day start-stop time.Perhaps be the poorest unit without oxygen-eliminating device operation of operating condition in the world.
The utility model mainly relies on the deaeration in condenser of condenser, and chemical deoxidization comprises behind the solidifying pump that condensate water adds hydrazine and feedwater adds hydrazine, and the dissolved oxygen content of condensate water is directly connected to the dissolved oxygen content of feedwater.So, the content of control condensate water dissolved oxygen and to control timely the addition of oxygen scavenger according to the variation of oxygen content particularly important.
Power plant condensation water dissolved oxygen and feedwater dissolved oxygen are one of important indicators of power plant chemistry supervision, regulation requirement according to the thermal power plant technical supervision, the condensate water dissolved oxygen content of applicant place power plant≤50 μ g/L, feedwater dissolved oxygen content≤15 μ g/L(are when superheated steam pressure is 3.8MPa～5.8MPa), when≤7 μ g/L(are 5.9MPa～12.6MPa when superheated steam pressure), the condensate water dissolved oxygen exceeds standard and can accelerate the corrosion of condensing water conduit, because oxygen and metal form galvanic cell in water, make the metal electrochemical corrosion, its corrosion mechanism is as follows:
Cathodic region: 1/2O
2+ H
2O+2e → 2OH
-
Anode region: Fe → Fe
2++ 2e;
When ferrous ion and hydroxide ion meet, will generate Fe (OH) in water
2Precipitation:
Fe
2++2OH
-→Fe(OH)
2
In the excessive situation of dissolved oxygen, Fe (OH)
2The further oxidation of meeting generates yellow FeOOH or Fe
2O
3, accelerate the heat power equipment corrosion of metal.
The utlity model has following innovative technology main points
1, the bad working environments that causes for the Combined Cycle Unit frequent start-stop has proposed the optimization operational mode without the oxygen-eliminating device system first, has effectively controlled the dissolved oxygen corrosion, has improved unit operation economy and security.
2, systematically studied first without oxygen-eliminating device Combined Cycle Unit dissolved oxygen corrosion mechanism and preservative mechanism, obtained valuable on-the-spot service data, for Combined Cycle Unit is laid a good foundation without the production domesticization of oxygen-eliminating device operational system.
3, proposed first to utilize the magnetic detection method to realize the Non-Destructive Testing of oxide skin, energy Quick test tube inner oxide significantly shortens and detects the duration, improves Detection accuracy.
4, unit normal operation period deaerating effect is good, and the condensate water oxygen concentration remains in the 10 μ g/L always.
5, starting and stopping period, the content overproof of dissolved oxygen, approximately after 10 minutes, dissolved oxygen is down in the critical field.
6, obtain following beneficial effect:
1) open in the machine 10 minutes, dissolved oxygen content exceeds standard, and is normal subsequently; Normal operation period, the condensate water oxygen concentration is in 10 μ g/L; No. 1 unit dissolved oxygen qualification rate 99.3%.
2) strengthen the peak load regulation ability: simplified start-up routine, shortened a machine time, saved time: hot 30-60 minute, cold conditions 2 hours, unit adopts without the oxygen-eliminating device operation, is conducive to bring into play the advantage of quick startup.
3) reduce operations staff's working strength: improved on the basis of unit operation economy, reduced the time of unit starting.
4) condensate water deaerating effect
The utility model is on probation over 5 years, and deaerating effect is good during three unit operations, the unit normal operation period, the condenser condensed water degree of supercooling maintains about 2 ℃, and the condensate water oxygen concentration remains in the 10 μ g/L always, such as Fig. 2 (the condensate water oxygen concentration of red line for detecting, black line is generating unit speed), daytime December 21, during the unit operation, condenser vacuum 96.89, corresponding saturation temperature is 30.8 ℃, the hot well water temperature is 28.8 ℃, and degree of supercooling is 2 ℃, and the condensate water oxygen concentration is 5.42 μ g/L.
5) main experiences and actual achievement:
At first, save capital expenditure and operation expense
Owing to not having oxygen-eliminating device and relevant equipment and system, therefore can save construction investment approximately, because system is simple and reliable, and the operation maintenance workload is few, operation and maintenance cost is also lower again.
Secondly, performance driving economy improves
Behind the cancellation oxygen-eliminating device, the steam discharge heat loss of oxygen-eliminating device, medium-loss and the oxygen-eliminating device heating steam restriction loss of drawing gas has not all had, and after fore pump cancellation, condensate pump pressure head reduced in the heat regenerative system, pump power reduced, station service is saved, and these all can make performance driving economy improve.Fig. 5 is 2008～2011 direct productive power rate comparison diagrams of the front gulf #1 of power plant unit, the direct productive power rate of power plant maintain every year 3% low-level; Have document to calculate and can improve 0.84～1.17% ［ 2 ］ without the total economic benefit of oxygen-eliminating device therrmodynamic system, Fig. 6 is front gulf power plant #1 unit generation coal consumption in 2008～2011 comparison diagram, and consumption of standard coal for power generation maintains lower level.
The 3rd, operational reliability improves
Power plant all can utilize the unit maintenance chance every year, the therrmodynamic system steam-water pipe is carried out the inspection of extent of corrosion, pipeline is subjected to the degree of oxygen corrosion very low, wall thickness corrosion thinning situation is rarely found, the internal inspection of three boilers can both reach the safety detection requirement of boilers and pressure vessel for many years, and unit operation over 5 years several heating surface tubes in boilers booster events occured once, but be due to the frequent fatigue damage of unit day start and stop, pipeline does not almost have because of the corrosion leakage situation.
Claims (2)
1. the quick start system of a Combined Cycle Unit comprises condenser (20), it is characterized in that: the delivery port of condenser (20) connects the input of condensing water flow meter (1) by condensate pump (5), shaft sealing cooler (6); The output of described condensing water flow meter (1) is divided into two the tunnel, and the condensate water shut-off valve (2) of leading up to is communicated with the boiler of Combined Cycle Unit, and another road connects the water return outlet of condenser (20) by recirculation shut-off valve (3), recirculation control valve (4); The venthole of condenser (20) connects vavuum pump (9) by air valve; Setting adds hydrazine point and dissolved oxygen content test point between the recirculation water water inlet of condensate pump (5) delivery port and condenser (20), arranges at the low pressure water inlet place of boiler to add hydrazine point and dissolved oxygen content test point.
2. the quick start system for Combined Cycle Unit according to claim 2, it is characterized in that: the venthole of described condenser (20) is connected with air valve by one of air valve (6) and two (7) is connected with one of air intake of vavuum pump (9), the gas outlet of vavuum pump (9) is divided into two the tunnel after by gas ejector (10), one the tunnel connects two (7) junction of one of air valve (6) and air valve, and another road is by the air intake of three (11) connection steam-water separators (30) of air valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280985 CN202709076U (en) | 2012-06-14 | 2012-06-14 | Quick start system of combined cycle unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220280985 CN202709076U (en) | 2012-06-14 | 2012-06-14 | Quick start system of combined cycle unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202709076U true CN202709076U (en) | 2013-01-30 |
Family
ID=47589373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220280985 Expired - Fee Related CN202709076U (en) | 2012-06-14 | 2012-06-14 | Quick start system of combined cycle unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202709076U (en) |
-
2012
- 2012-06-14 CN CN 201220280985 patent/CN202709076U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20130614 |